click on the green flag, Move the mouse over an object and press SPACE to pick up its color. Then a large dot of the captured color will appear in the lower left corner
Grazie a @frodewin per l'algoritmo ottimizzato per controllare il colore: https://scratch.mit.edu/projects/13412067/ L'algoritmo è spiegato in questo tutorial: https://youtube.com/watch?v=aBTh756kCZw